Two populations of birds stop interbreeding over time because they develop different song patterns. what type of isolation does this describe?

If two populations of birds stop interbreeding because of a difference in song patterns this would be described as behavioral isolation.

Codominance is when alleles have the same amount of dominance and both are expressed in a heterozygous individual(ab blood type, roan cow). in a heterozygote with incomplete dominance, the phenotype seen is an intermediate of the dominant and recessive phenotype.(pink flowers when the dominant form is red snd recessive form is white)